Tuesday, May 8, 2012

664

664 = 2 x 2 x 2 x 83.

664 is a value of n such that n(n + 7) is a palindrome (445544).

664 is 554 in base 11 and 474 in base 2.

664 is a generalized heptagonal number (A085787).

664 is the solution to the postage stamp problem for 6 denominations and 7 stamps (A001211).

664 is the sum of three distinct positive cubes (A024975): 664 = 83 + 53 + 33.


Source: What's Special About This Number?

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